Very professional-looking with that gorgeous lining and the grommets. Grandmas always need strong straps because they keep half their lives in their bags! :D Got enough yarn leftover to do that for her? If not, you could tell her the bag would just hang too low with longer straps, and that doubled straps wouldn't fit through the holes.
Tell her that MY booga straps stretched quite a bit once I loaded it up with my heavy stuff. I am thinking of going back and cutting them off and re-knotting. Your bag looks fantastic. I didn't line mine, but now I want to.
OTN: Jaywalker Socks in KP "Dancing"